Let you change your admin menu color for every site.
If you ever changed your site just to figure after few minutes your on the wrong environment this extension is for you. Drupal Environment Indicator let you change admin menu colors to distinguish between your sites and environments. Doesn't need any module to be installed on server side. Just enable this extension and stop the sites confusion.
- (2016-12-23) Mark Fullmer: As of Dec 2016: Drupal 7: this seems to require "admin_menu" to be enabled, as opposed to just "toolbar". It does not work with the "navbar" module backport. Drupal 8: Works on the default administration menu ("navbar") provided in D8.